package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.UUID;

/**
 * @author huhanzhao
 * @create 2022-11-07-12:11
 */
@RestController
@Slf4j
@RequestMapping("/common")
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){
        //file是一个临时文件需要转存
        log.info("数据{}",file);
        //原始文件名
        String originalFilename = file.getOriginalFilename();
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        //使用uuid给文件命名,防止文件名称重复造成文件覆盖
        String fileName = UUID.randomUUID().toString() + suffix;
        //判断路径是否存在，不存在就创建
        File dir = new File(basePath);
        if (!dir.exists()){
            dir.mkdirs();
        }
        //转存
        try {
            file.transferTo(new File(basePath + fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(fileName);
    }

    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        try {
            //输入流读取文件
            FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));
            //输出流写回浏览器
            ServletOutputStream outputStream = response.getOutputStream();

            //声明是图片类型
            response.setContentType("imag/jpeg");
            //读写操作
            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = fileInputStream.read(bytes)) != -1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }
            //关流
            fileInputStream.close();
            outputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}
